Here is a link to a video from Edutopia entitled: "Rigorous Project-Based Learning Transforms AP Courses"
video

It uses two main examples, AP Government and AP Environmental Science, but has applications for other AP courses as well.

At the end of the video there are 3 links to further resources:

Knowledge in Action Research Project (designed to scale PBL for AP classes to a wide range of environments from lower socio-economic level rural schools to affluent suburban schools
Project-Based Learning Research Review
Examples and tools for Project Based Learning